* Most common: A 6.2L V8 engine. This was the most prevalent engine in the 2007 model year.
* Less common: A 5.3L V8 engine was also available, though less frequently found than the 6.2L.
So while there wasn't just *one* motor, the 6.2L V8 was the primary engine choice for the 2007 Cadillac Escalade.